Explanation: A Class A amplifier operates in its linear region, meaning it amplifies the input signal faithfully without distortion, as long as the signal stays within certain limits. Its "signal-handling capability" refers to how large an input signal it can amplify before distortion, primarily clipping, occurs. Clipping happens when the instantaneous voltage of the input signal, particularly its peaks, causes the amplifier's output to reach the limits of its power supply rails or bias point. When the peak of the input signal exceeds these limits, the output waveform gets flattened, introducing harmonic distortion. Therefore, **peak voltage (C)** is the most valuable parameter. It directly represents the maximum instantaneous excursion of the input signal, which determines whether the amplifier will be driven into clipping. * **Average voltage (A)** for an AC signal is typically zero, offering no information about its amplitude. * **RMS voltage (B)** is an effective value useful for power calculations but does not directly indicate the instantaneous maximums where clipping occurs. A signal with a high RMS value but low peaks might not clip, while a signal with a lower RMS value but sharp, high peaks could. * **Resting voltage (D)** refers to the amplifier's DC operating point without an input signal, not the amplitude of the input signal itself.